Caterpillar 140G Grader blade tip cylinder, RHS blade up down cylinder doesn’t neutralize after pushing out until Push lever in opposite direction

Looking for some help with this issue. On my Caterpillar 140G Grader, the RHS blade up down cylinder won't neutralize after being pushed out—it only stops when I push the lever the opposite direction. This problem showed up after a mechanic re-sealed the right side valve bank.

What's the grader serial number?

Hi, 50H0658, South Africa

I'd guess the valve bank got reassembled wrong or the lines got hooked up incorrectly. Do you have a Parts Manual? You're probably going to need one if you don't.

Not sure what you mean about a prefix, but I'm looking at 140G motor graders here.

Start by checking whatever was just worked on—that's usually where the problem shows up after a repair.

It's likely binding up. If the springs check out okay, sometimes it's how the sections got tightened and torqued. Try loosening them and retightening in a more even sequence. You can test this with the machine off by loosening the bolts to see if it moves freely.